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Entry 1 sense Webster, 1913

humidify

· IPA /hjuːˈmɪdɪfaɪ/
01 v. t. to render (gases, especially air) humid or to increase the moisture content of; as, We have a machine that humidifies the air in the house.
  1. 1.
    to render (gases, especially air) humid or to increase the moisture content of; as, We have a machine that humidifies the air in the house.
Syn. moisturize, make humid, make more humid.